Monitor display screen with a graphical user interface



FIG. 1 is a front view of the display screen with a graphical user interface of the present design; and,

FIG. 2 is a front view of a second embodiment thereof.

The broken line showing of the monitor display screen forms no part of the claimed design. 

CLAIM The ornamental design for a monitor display screen with a graphical user interface, as shown and described. 